CN114085953B - Control method for acid dissolution of aluminum in aluminum-containing cold heading steel - Google Patents
Control method for acid dissolution of aluminum in aluminum-containing cold heading steel Download PDFInfo
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- CN114085953B CN114085953B CN202111334957.6A CN202111334957A CN114085953B CN 114085953 B CN114085953 B CN 114085953B CN 202111334957 A CN202111334957 A CN 202111334957A CN 114085953 B CN114085953 B CN 114085953B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/108—Feeding additives, powders, or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/116—Refining the metal
- B22D11/117—Refining the metal by treating with gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention provides an acid-soluble aluminum control method for aluminum-containing cold heading steel, which relates to the technical field of smelting and steelmaking and comprises the following steps: converter steelmaking, deoxidation alloying, argon blowing of an argon blowing station, LF furnace refining, calcification treatment, protective pouring and continuous casting control; the invention adopts high-aluminum ferromanganese to replace aluminum ferromanganese and aluminum wires for molten steel deoxidation and alloying, utilizes the high-aluminum ferromanganese to directly improve the acid-soluble aluminum content of the molten steel, reduces the aluminum wire feeding or no aluminum wire feeding of an argon blowing station, has high production efficiency, calculates and determines the addition amount of the high-aluminum ferromanganese according to the requirements of the converter terminal oxygen and the acid-soluble aluminum component of the molten steel entering the station, adds the high-aluminum ferromanganese and the low-carbon ferromanganese to the molten steel tank in the converter tapping process to achieve the molten steel deoxidation and meet the acid-soluble aluminum content requirement of the molten steel entering the station, and can realize the reduction of the aluminum wire feeding or no aluminum wire feeding after the molten steel enters the argon blowing station.
Description
Technical Field
The invention relates to the technical field of smelting steel, in particular to an acid-soluble aluminum control method for aluminum-containing cold forging steel.
Background
The converter smelting aluminum-containing cold forging steel, because the acid-soluble aluminum content in the steel is required to be higher, the original process is to perform deoxidation and alloying in a converter workshop, the acid-soluble aluminum increase is mainly realized by feeding aluminum wires in a refining workshop, namely when the smelting end point composition and the temperature of the converter meet the process requirements of steel grades, aluminum ferromanganese and low-carbon ferromanganese are added into a molten steel tank in the tapping process for deoxidation and alloying, the aluminum ferromanganese mainly plays a role in deoxidation, but not the role in improving the acid-soluble aluminum content of the molten steel, then after the molten steel enters an argon blowing station, the amount of the aluminum wires is determined according to the oxygen determination of the molten steel and the acid-soluble aluminum content of the molten steel of an argon front sample, a large amount of aluminum wires are fed by a wire feeder to improve the acid-soluble aluminum content of the molten steel, and the aluminum wires play a role in improving the acid-soluble aluminum content of the molten steel;
however, this technique has the following drawbacks and disadvantages: 1. a large amount of aluminum wires are fed, the argon blowing station time is occupied, and the production period is prolonged;
2. after a large amount of aluminum wires are fed to increase acid-soluble aluminum, the loss of the acid-soluble aluminum in the molten steel is large and the acid-soluble aluminum in the molten steel is reduced because the oxygen content in slag is still high;
3. the deoxidation product produced with aluminium wire is FeO. Al 2 O 3 The melting point is high, and the deoxidation product is not easy to float;
4. because the price of the aluminum wire is high and the consumption of the aluminum wire is large, a large amount of aluminum wires are fed through the wire feeding machine in the argon blowing station, so that the acid dissolution of aluminum in the molten steel entering the station is improved, and the alloy cost is not favorably reduced;
5. the aluminum content of the aluminum-manganese-iron is low, the same acid-soluble aluminum content of molten steel is improved, the addition amount of the aluminum-manganese-iron is larger than that of high-aluminum-manganese-iron, the addition amount of alloy is increased, and the reduction of the tapping temperature of the converter is not facilitated;
6. the molten steel enters an argon blowing station and needs oxygen determination detection, and the oxygen determination cost of the argon blowing station is increased, so that the invention provides an acid-soluble aluminum control method for aluminum-containing cold forging steel to solve the problems in the prior art.
Disclosure of Invention
Aiming at the problems, the invention provides an acid-soluble aluminum control method for aluminum-containing cold forging steel, which adopts high-aluminum-manganese-iron to replace aluminum-manganese-iron and aluminum wires to perform molten steel deoxidation and alloying, utilizes the high-aluminum-manganese-iron to directly improve the acid-soluble aluminum content of the molten steel, reduces the feeding of the aluminum wires or no feeding of the aluminum wires in an argon blowing station and has high production efficiency.
In order to realize the purpose of the invention, the invention is realized by the following technical scheme: an acid-soluble aluminum control method for aluminum-containing cold heading steel comprises the following steps:
the method comprises the following steps: converter steelmaking
Molten iron is loaded into a converter, and the molten iron is required to be as follows: silicon =0.30-0.80%, manganese is less than or equal to 0.50%, phosphorus is less than or equal to 0.15%, sulfur is less than or equal to 0.030%, the temperature is more than or equal to 1250 ℃, steel making is carried out, and then the components at the end point of the converter are controlled as follows: carbon =0.05-0.09%, phosphorus is less than or equal to 0.012%, and sulfur is less than or equal to 0.020%;
step two: deoxidation alloying
Carrying out deoxidation alloying on high-aluminum ferromanganese and low-carbon ferromanganese, controlling the steel output of the converter according to the requirements of end-point oxygen determination and acid-soluble aluminum content of entering stations, adding deoxidizers of silicon-aluminum-barium, high-aluminum ferromanganese, low-carbon ferromanganese and silicon-aluminum-barium, and controlling the acid-soluble aluminum content of molten steel entering an argon blowing station;
step three: blowing argon in argon blowing station
Adding synthetic slag into molten steel before tapping, adding lime particles into the molten steel after tapping, entering an argon blowing station after tapping, regulating the pressure of the argon gas to be 0.2-0.8Mpa according to the turning condition of the molten steel, turning the molten steel liquid surface mainly without blowing suddenly, and then determining whether to feed aluminum wires to adjust the acid-soluble aluminum content according to the acid-soluble aluminum content of the molten steel of an argon front sample;
step four: refining in LF furnace
Introducing molten steel into an LF (ladle furnace) for refining, controlling the refining time of the LF for 45-70 min, controlling the power transmission time to be more than or equal to 20min, rapidly melting slag at the early stage of smelting in the LF, controlling the stirring time of large argon in the LF refining process to control the content of returned silicon and the content of sulfur discharged from a station, matching with a gold bulk material, performing internal control standard adjustment on the manganese content in the molten steel, and simultaneously feeding an aluminum wire to adjust the content of acid-soluble aluminum in the molten steel according to the content of acid-soluble aluminum in the molten steel and the station time;
step five: calcification treatment
Carrying out calcification treatment according to the content of acid-soluble aluminum in molten steel, feeding a CaFe line, carrying out soft argon blowing for 2-3min, then feeding the CaFe line for more than or equal to 500m, carrying out soft argon blowing for more than 5min after the soft argon blowing is finished, carrying out temperature measurement sampling, adding a ladle composite heat-insulating agent, taking out of a station and putting on the station;
step six: protective casting
Pouring molten steel into a crystallizer, protecting the pouring by using a long nozzle, forbidding open pouring, sleeving a large ladle long nozzle on a tundish high-alkalinity covering agent during pouring, controlling the secondary oxidation of the poured molten steel, preventing molten steel of a tundish from being exposed, completely sealing a tundish cover plate and a tundish by adopting refractory fibers and fire clay, and tightly covering a stopper rod hole and other holes in the cover plate after an aluminum silicate fiber felt is processed into a corresponding regular hole shape;
step seven: continuous casting control
Electromagnetic stirring and casting blanks are started in the crystallizer, the ladle long nozzle and the ladle lower nozzle are protected and poured by adopting a sealing gasket and an argon seal, argon is ensured to reach the top end of the long nozzle, the loss of acid-soluble aluminum is controlled within 0.010 percent in the pouring process, and the ratio of the acid-soluble aluminum in the tundish molten steel to the total aluminum is controlled to be more than or equal to 90 percent.
The further improvement is that: in the first step, the converter adopts a slag blocking rod to block slag, the slag amount of tapping is strictly controlled to be less than 50ppm, and in the first step, the terminal point of the converter is subjected to oxygen determination, and the oxygen content is controlled to be less than or equal to 900ppm.
The further improvement lies in that: in the second step, the steel output of the converter is controlled to be 120t, 40-60kg of deoxidizer silicon-aluminum-barium, 500-700kg of high-aluminum-manganese-iron, 250-350kg of low-carbon manganese-iron and 20-60kg of silicon-aluminum-barium are added in each furnace, and the acid-soluble aluminum of the molten steel entering the argon blowing station is controlled to be Als =0.035-0.050%.
The further improvement is that: and in the third step, 200kg of synthetic slag per furnace is added into the molten steel before tapping, and 100kg of lime particles per furnace is added into the molten steel after tapping.
The further improvement is that: in the third step, when the content of acid-soluble aluminum meets the requirement, no aluminum wire is fed, when the content of acid-soluble aluminum is low, the aluminum wire is fed to carry out fine adjustment of acid-soluble aluminum, and the content is controlled to be between 0.035% and 0.050%.
The further improvement lies in that: in the fourth step, proper aluminum particles and calcium carbide are added according to slag conditions in the power transmission process of the LF refining furnace for deoxidation operation, so that the color of the slag is white, the white slag is kept for more than 15min, and the reductive slag is used for desulfurization, degassing and impurity removal.
The further improvement lies in that: in the fourth step, the stirring time of the big argon is controlled in the LF refining process to control the content of the returned silicon within 0.03 percent, so that the content of finished silicon is less than 0.05 percent, the content of sulfur at the out-station is less than or equal to 0.010 percent, in the third step, the content of acid-soluble aluminum in the molten steel is adjusted, the content of the acid-soluble aluminum is controlled within 0.030-0.045 percent before 15 minutes at the out-station, and the content of the acid-soluble aluminum in the molten steel cannot be adjusted by using an aluminum wire within 15 minutes before the out-station.
The further improvement lies in that: in the fifth step, the ladle composite heat-insulating agent does not use a heat-insulating agent with high silicon dioxide content, and after the wire feeding is finished in the LF furnace, the soft blowing time of more than 5min must be ensured.
The further improvement is that: and in the seventh step, the crystallizer is started to electromagnetically stir, the current is controlled to be 320-350A, the frequency is controlled to be 5Hz, and the casting blank pulling speed is 2.5-3.0 m/min.
The beneficial effects of the invention are as follows:
1. the invention adopts high-aluminum ferromanganese to replace aluminum ferromanganese and aluminum wires for molten steel deoxidation and alloying, utilizes the high-aluminum ferromanganese to directly improve the acid-soluble aluminum content of the molten steel, reduces the feeding or non-feeding of the aluminum wires in the argon blowing station, and has high production efficiency.
2. The invention calculates and determines the adding amount of high-aluminum-manganese-iron according to the requirements of the converter terminal oxygen and the acid-soluble aluminum of the incoming molten steel, and adds the high-aluminum-manganese-iron and the low-carbon-manganese-iron into the molten steel tank in the tapping process of the converter to deoxidize the molten steel and meet the requirements of the incoming molten steel on the acid-soluble aluminum content, and can realize the reduction of aluminum wire feeding or no aluminum wire feeding after the molten steel enters the argon blowing station.
3. The method has the advantages that the acid-soluble aluminum content of the incoming molten steel is directly increased, the oxygen content of the molten steel is very low, the deoxidation product is low, the oxygen determination of the incoming molten steel is meaningless, the oxygen determination operation of the molten steel in an argon blowing station can be eliminated, and the oxygen determination inspection cost is saved.
4. The method increases the using amount of the high-aluminum ferromanganese in the converter process to improve the acid-soluble aluminum content of the molten steel, reduces the oxidability in slag while reducing the oxygen content of the molten steel, is more favorable for stabilizing the acid-soluble aluminum content of the molten steel, reduces the tapping temperature of the converter, and creates conditions for manufacturing the reduction white slag by the LF furnace.
5. The invention adopts high-aluminum ferromanganese to replace aluminum ferromanganese and aluminum wires to control the acid dissolution of aluminum-containing cold forging steel, can stabilize the control effect of acid dissolution of aluminum in molten steel, and achieve the aims of saving wire feeding time of an argon blowing station and reducing alloy cost.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
For the purpose of enhancing understanding of the present invention, the present invention will be further described in detail with reference to the following examples, which are provided for illustration only and are not intended to limit the scope of the present invention.
According to the figure 1, the embodiment provides an aluminum-containing cold heading steel acid-soluble aluminum control method, which comprises the following steps:
the method comprises the following steps: converter steelmaking
Charging molten iron into a converter, wherein the molten iron requires: silicon =0.30-0.80%, manganese is less than or equal to 0.50%, phosphorus is less than or equal to 0.15%, sulfur is less than or equal to 0.030%, the temperature is more than or equal to 1250 ℃, steel making is carried out, a slag blocking rod is adopted for a converter to block slag, the slag discharging amount of steel tapping is strictly controlled to be less than 50ppm, and then the terminal point components of the converter are controlled as follows: carbon =0.05-0.09%, phosphorus is less than or equal to 0.012%, sulfur is less than or equal to 0.020%, oxygen is determined at the end point of the converter, and the oxygen content is controlled to be less than or equal to 900ppm;
step two: deoxidation alloying
Carrying out deoxidation alloying on high-aluminum ferromanganese and low-carbon ferromanganese, controlling the tapping quantity of a converter to be 120t according to the requirements of end-point oxygen determination and entering acid-soluble aluminum content, adding 40-60kg of deoxidizer silicon-aluminum-barium per furnace, 500-700kg of high-aluminum ferromanganese per furnace, 250-350kg of low-carbon ferromanganese per furnace and 20-60kg of silicon-aluminum-barium per furnace, and controlling the acid-soluble aluminum of molten steel entering an argon blowing station to be Als =0.035-0.050%;
step three: blowing argon in argon blowing station
Adding 200kg of synthetic slag per furnace into molten steel before tapping, adding 100kg of lime particles per furnace into the molten steel after tapping, enabling the molten steel to enter an argon blowing station, adjusting the pressure of argon gas to 0.2-0.8Mpa according to the turning condition of the molten steel, turning the molten steel liquid surface, but not blowing suddenly, then determining whether to feed an aluminum wire to adjust the acid-soluble aluminum content according to the acid-soluble aluminum content of the molten steel before argon, when the acid-soluble aluminum content meets the requirement, not feeding the aluminum wire, and when the acid-soluble aluminum content is lower, feeding the aluminum wire to finely adjust the acid-soluble aluminum, wherein the acid-soluble aluminum content is controlled to be more than or equal to 0.035% and less than or equal to 0.050%;
step four: refining in LF furnace
Introducing molten steel into an LF furnace for refining, controlling the refining time of the LF furnace to be 45-70 min, controlling the power transmission time to be more than or equal to 20min, rapidly melting slag at the early stage of smelting in the LF furnace, adding proper aluminum particles and calcium carbide to perform deoxidation operation according to the slag condition in the power transmission process of the LF refining furnace, ensuring that the color of the slag is white, keeping the white slag time to be more than 15min, performing desulfurization, degassing and impurity removal by using reducing slag, controlling the stirring time of argon gas in the LF refining process, controlling the returned silicon to be within 0.03%, ensuring that the silicon content of a finished product is less than 0.05%, controlling the sulfur content of an ex-station to be less than or equal to 0.010%, matching with a gold bulk material, performing internal control standard adjustment on the manganese content in the molten steel, simultaneously feeding an aluminum wire to adjust the acid-soluble aluminum content in the molten steel according to the acid-soluble aluminum content in the molten steel and the time of the ex-station, controlling the acid-soluble aluminum content to be within 0.030-0.045% before 15min, and adjusting the acid-soluble aluminum particles in the molten steel before the ex-station;
step five: calcification treatment
Carrying out calcification treatment according to the content of acid-soluble aluminum in molten steel, feeding a CaFe line, carrying out soft argon blowing for 2-3min, then feeding the CaFe line for more than or equal to 500m, carrying out soft argon blowing for more than 5min after the soft argon blowing is finished, carrying out temperature measurement sampling, taking a steel ladle composite heat-insulating agent without a high-silicon dioxide heat-insulating agent out of a station and placing the steel ladle composite heat-insulating agent on the station, and ensuring soft blowing time of more than 5min after the wire feeding treatment of an LF furnace is finished;
step six: protective casting
Pouring molten steel into a crystallizer, protecting the pouring by using a long nozzle, forbidding open pouring, sleeving a large ladle long nozzle on a tundish high-alkalinity covering agent during pouring, controlling the secondary oxidation of the poured molten steel, preventing molten steel of a tundish from being exposed, completely sealing a tundish cover plate and a tundish by adopting refractory fibers and fire clay, and tightly covering a stopper rod hole and other holes in the cover plate after an aluminum silicate fiber felt is processed into a corresponding regular hole shape;
step seven: continuous casting control
Electromagnetic stirring is started in a crystallizer, the current is controlled to be 320-350A, the frequency is 5Hz, the casting blank drawing speed is 2.5-3.0 m/min, a ladle long water gap and a tundish lower water gap are sealed and protected by sealing gaskets and adding argon to pour, the argon is ensured to reach the top end of the long water gap, the acid-soluble aluminum loss is controlled within 0.010 percent in the pouring process, the ratio of the acid-soluble aluminum to the total aluminum of tundish molten steel is controlled to be more than or equal to 90 percent, D-type inclusions in the produced continuous casting square billet steel are less than or equal to 2.0 grade, and Ds-type inclusions are less than or equal to 2.0 grade; the loosening and cracking grade is less than or equal to 1.5 grade, and the macroscopic defect meets the requirement.
Verification example:
the aluminum-containing cold forging steel prepared by the method comprises the following components: c =0.10-0.23%, si is less than or equal to 0.10%, mn =0.30-0.60%, P is less than or equal to 0.030%, S is less than or equal to 0.030%, and Als is more than or equal to 0.020%.
Because aluminum-containing cold forging steel requires high acid-soluble aluminum content, and aluminum and oxygen have strong affinity, the aluminum part added into molten steel is involved in deoxidation and is oxidized, so that in the process operation, the end-point carbon control must be improved and the end-point oxygen content of the converter is reduced to stably control the acid-soluble aluminum in the molten steel; adding tapping slag to prevent tapping slag; adjusting argon blowing pressure, and strictly prohibiting argon blowing and sudden blowing of molten steel in an argon blowing station; reducing slag is produced in an LF furnace and calcification treatment is carried out to achieve the aims of desulfurization, deoxidation, degassing and impurity removal; strengthening continuous casting protection pouring, preventing acid-soluble aluminum loss and the like.
The high-Al-Mn-Fe is a composite deoxidizer, and the deoxidized product is FeO, mnO and Al 2 O 3 The melting point is low, and the deoxidation product is easy to float. The deoxidized product of the aluminum wire is FeO.Al 2 O 3 The melting point is high, and the deoxidation product is not easy to float. Because the aluminum-manganese-iron contains about 22 percent of aluminum and the high-aluminum-manganese-iron contains about 44 percent of aluminum, the aluminum content is improved by 50 percent, and the deoxidation alloying of the high-aluminum-manganese-iron has better effect than the deoxidation alloying of the aluminum-manganese-iron and the aluminum wire.
The quality of the cold forging steel containing aluminum requires low silicon, low sulfur, low phosphorus, high aluminum, less gas and impurities, and the like, so the process route needs to be refined in an LF furnace. The LF furnace refining mainly achieves the purposes of deoxidation, desulfurization, degassing and impurity removal by manufacturing reducing slag and reducing the oxidability of the slag, if the oxidability in the slag cannot be reduced during converter tapping, the oxygen content in aluminum granules for removing slag is also adopted in the LF furnace refining. Therefore, the use level of high-aluminum ferromanganese is increased in the converter, so that the acid-soluble aluminum content in the incoming station is increased, the oxidizability in the slag is reduced, and favorable conditions are created for stabilizing the acid-soluble aluminum content and refining the reducing slag in the LF furnace.
The invention adopts high aluminum manganese iron to replace aluminum manganese iron and aluminum wires for molten steel deoxidation and alloying, utilizes the high aluminum manganese iron to directly improve the acid-soluble aluminum content of the molten steel, reduces the feeding of aluminum wires or no feeding of aluminum wires in an argon blowing station, has high production efficiency, calculates and determines the adding amount of the high aluminum manganese iron according to the requirements of converter end point oxygen and the acid-soluble aluminum content of the molten steel entering the station, adds the high aluminum manganese iron and low carbon manganese iron into a molten steel tank in the process of converter tapping, achieves the deoxidation of the molten steel and meets the acid-soluble aluminum content requirement of the molten steel entering the station, can reduce the feeding of aluminum wires or no feeding of aluminum wires after the molten steel enters the argon blowing station, and simultaneously can save the oxygen determination inspection cost by increasing the using amount of the high aluminum manganese iron to improve the acid-soluble aluminum content of the molten steel, reducing the oxygen content of the deoxidation product, eliminating the oxygen determination operation of the molten steel in the argon blowing station, saving the oxygen determination inspection cost, additionally, can reduce the oxidizing property of the molten steel in the argon blowing station, more stabilize the molten steel oxygen determination operation, reduce the aluminum-soluble aluminum content, and reduce the aluminum wire temperature of the molten steel, and reduce the aluminum alloy production cost of the molten steel by adopting the LF converter, and the invention.
The foregoing shows and describes the general principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. An acid-soluble aluminum control method for aluminum-containing cold heading steel is characterized by comprising the following steps:
the method comprises the following steps: converter steelmaking
Molten iron is loaded into a converter, and the molten iron is required to be as follows: silicon =0.30-0.80%, manganese is less than or equal to 0.50%, phosphorus is less than or equal to 0.15%, sulfur is less than or equal to 0.030%, the temperature is more than or equal to 1250 ℃, steel making is carried out, and then the end point components of the converter are controlled as follows: carbon =0.05-0.09%, phosphorus is less than or equal to 0.012%, and sulfur is less than or equal to 0.020%;
step two: deoxidation alloying
Carrying out deoxidation alloying on high-aluminum ferromanganese and low-carbon ferromanganese, controlling the steel output of the converter according to the requirements of end-point oxygen determination and acid-soluble aluminum content of entering stations, adding deoxidizers of silicon-aluminum-barium, high-aluminum ferromanganese, low-carbon ferromanganese and silicon-aluminum-barium, and controlling the acid-soluble aluminum content of molten steel entering an argon blowing station;
step three: blowing argon in argon blowing station
Adding synthetic slag into molten steel before tapping, adding lime particles into the molten steel after tapping, feeding the molten steel into an argon blowing station after tapping, regulating the argon pressure to 0.2-0.8Mpa according to the turning condition of the molten steel, turning the molten steel liquid surface mainly but not blowing suddenly, and then determining whether to feed an aluminum wire to adjust the acid-soluble aluminum content according to the acid-soluble aluminum content of the molten steel of an argon front sample;
step four: refining in LF furnace
Introducing molten steel into an LF furnace for refining, controlling the refining time of the LF furnace for 45-70 min, controlling the power transmission time to be more than or equal to 20min, rapidly melting slag at the early stage of smelting in the LF furnace, controlling the stirring time of argon gas in the LF refining process to control the content of returned silicon to be within 0.03%, ensuring the content of finished silicon to be less than 0.05%, controlling the content of sulfur to be less than or equal to 0.010% at the end of the smelting, adjusting the content of acid-soluble aluminum in the molten steel by matching with a gold bulk material according to the content of acid-soluble aluminum in the molten steel and the time of the molten steel at the end of the smelting, simultaneously feeding an aluminum wire to adjust the content of acid-soluble aluminum in the molten steel according to the content of acid-soluble aluminum in the molten steel and the time of the molten steel at the end of the smelting, controlling the content of acid-soluble aluminum to be within 0.030-0.045% before 15min at the end of the smelting, and not adjusting the content of acid-soluble aluminum wire in the molten steel within 15min before the end of the tapping;
step five: calcification treatment
Carrying out calcification treatment according to the content of acid-soluble aluminum in molten steel, feeding a CaFe wire, soft blowing argon for 2-3min, then feeding the CaFe wire for more than or equal to 500m, after the soft blowing argon is more than 5min, carrying out temperature measurement sampling, and adding a ladle composite heat-insulating agent to be discharged and placed on a bench;
step six: protective casting
Pouring molten steel into a crystallizer, protecting pouring by using a long nozzle, forbidding open pouring, sleeving a large ladle long nozzle on a tundish high-alkalinity covering agent during pouring, controlling secondary oxidation of the poured molten steel, preventing molten steel of a tundish from being exposed, completely sealing a tundish cover plate and a tundish by adopting refractory fibers and fire clay, and tightly covering a stopper rod hole and other holes in the cover plate after an aluminum silicate fiber felt is processed into a corresponding regular hole shape;
step seven: continuous casting control
Electromagnetic stirring and casting blanks are started by the crystallizer, a ladle long nozzle and a ladle lower nozzle are protected and poured by adopting a sealing gasket and an argon seal, argon is ensured to reach the top end of the long nozzle, acid-soluble aluminum loss is controlled within 0.010% in the pouring process, and the ratio of acid-soluble aluminum to total aluminum in tundish molten steel is controlled to be more than or equal to 90%.
2. The aluminum-containing cold heading acid-soluble aluminum control method according to claim 1, wherein the method comprises the following steps: in the first step, the converter adopts a slag blocking rod to block slag, the slag discharging amount during tapping is strictly controlled to be less than 50ppm, and in the first step, the oxygen is determined at the end point of the converter, and the oxygen content is controlled to be less than or equal to 900ppm.
3. The aluminum-containing cold heading acid-soluble aluminum control method according to claim 1, wherein the method comprises the following steps: in the second step, the steel output of the converter is controlled to be 120t, 40-60kg of deoxidizer silicon-aluminum-barium, 500-700kg of high-aluminum-manganese-iron, 250-350kg of low-carbon manganese-iron and 20-60kg of silicon-aluminum-barium are added in each furnace, and the acid-soluble aluminum of the molten steel entering the argon blowing station is controlled to be Als =0.035-0.050%.
4. The aluminum-containing cold heading acid-soluble aluminum control method according to claim 1, wherein the method comprises the following steps: and in the third step, 200kg of synthetic slag per furnace is added into the molten steel before tapping, and 100kg of lime particles per furnace is added into the molten steel after tapping.
5. The method for controlling aluminum-containing cold heading acid-soluble aluminum according to claim 4, wherein the method comprises the following steps: in the third step, when the content of acid-soluble aluminum meets the requirement, no aluminum wire is fed, when the content of acid-soluble aluminum is low, the aluminum wire is fed to carry out fine adjustment of acid-soluble aluminum, and the content is controlled to be between 0.035% and 0.050%.
6. The method for controlling acid-soluble aluminum in aluminum-containing cold heading steel according to claim 1, wherein the method comprises the following steps: in the fourth step, proper aluminum particles and calcium carbide are added according to slag conditions in the power transmission process of the LF refining furnace for deoxidation operation, so that the color of the slag is white, the white slag is kept for more than 15min, and the reductive slag is used for desulfurization, degassing and impurity removal.
7. The method for controlling acid-soluble aluminum in aluminum-containing cold heading steel according to claim 1, wherein the method comprises the following steps: in the fifth step, the ladle composite heat-insulating agent does not need a heat-insulating agent with high silicon dioxide content, and after the LF furnace finishes treating and feeding wires, the soft blowing time of more than 5min must be ensured.
8. The aluminum-containing cold heading acid-soluble aluminum control method according to claim 1, wherein the method comprises the following steps: and in the seventh step, the crystallizer is started to electromagnetically stir, the current is controlled to be 320-350A, the frequency is controlled to be 5Hz, and the casting blank pulling speed is 2.5-3.0 m/min.
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| CN114836593A (en) * | 2022-05-09 | 2022-08-02 | 阳春新钢铁有限责任公司 | Smelting process of low-carbon aluminum-containing cold forging steel |
| CN115044739A (en) * | 2022-05-24 | 2022-09-13 | 柳州钢铁股份有限公司 | Method for quickly and accurately controlling aluminum under ultra-short process technology |
| CN115094299A (en) * | 2022-06-29 | 2022-09-23 | 阳春新钢铁有限责任公司 | Steelmaking production process of aluminum-containing cold forging steel |
| CN115627314A (en) * | 2022-10-08 | 2023-01-20 | 山东钢铁集团日照有限公司 | Smelting method of medium-carbon high-aluminum steel |
| CN115747614A (en) * | 2022-11-17 | 2023-03-07 | 唐山瑞丰钢铁（集团）有限公司 | Production method of steel for tinned substrate |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1614037A (en) * | 2004-09-14 | 2005-05-11 | 青岛钢铁控股集团有限责任公司 | High effective Al-Mn-Fe composite oxygen remover |
| CN102747269A (en) * | 2012-05-22 | 2012-10-24 | 内蒙古包钢钢联股份有限公司 | Low-silicon aluminum-containing steel and production method thereof |
| CN102943150A (en) * | 2012-11-26 | 2013-02-27 | 湖南华菱湘潭钢铁有限公司 | Refined slag control method |
| CN103469050A (en) * | 2013-09-22 | 2013-12-25 | 中天钢铁集团有限公司 | Aluminum-containing cold forging steel smelting process |
| CN107790663A (en) * | 2016-09-06 | 2018-03-13 | 鞍钢股份有限公司 | A kind of production method of Al killed cold heading steel |
| CN111719033A (en) * | 2020-06-30 | 2020-09-29 | 南阳汉冶特钢有限公司 | Low-cost rapid smelting method for aluminum-containing steel |
| CN113186458A (en) * | 2021-04-06 | 2021-07-30 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Medium carbon aluminum killed steel for cold heading and smelting method thereof |
-
2021
- 2021-11-11 CN CN202111334957.6A patent/CN114085953B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1614037A (en) * | 2004-09-14 | 2005-05-11 | 青岛钢铁控股集团有限责任公司 | High effective Al-Mn-Fe composite oxygen remover |
| CN102747269A (en) * | 2012-05-22 | 2012-10-24 | 内蒙古包钢钢联股份有限公司 | Low-silicon aluminum-containing steel and production method thereof |
| CN102943150A (en) * | 2012-11-26 | 2013-02-27 | 湖南华菱湘潭钢铁有限公司 | Refined slag control method |
| CN103469050A (en) * | 2013-09-22 | 2013-12-25 | 中天钢铁集团有限公司 | Aluminum-containing cold forging steel smelting process |
| CN107790663A (en) * | 2016-09-06 | 2018-03-13 | 鞍钢股份有限公司 | A kind of production method of Al killed cold heading steel |
| CN111719033A (en) * | 2020-06-30 | 2020-09-29 | 南阳汉冶特钢有限公司 | Low-cost rapid smelting method for aluminum-containing steel |
| CN113186458A (en) * | 2021-04-06 | 2021-07-30 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Medium carbon aluminum killed steel for cold heading and smelting method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 湘钢含铝冷镦钢开发及质量控制;王贵容等;《武汉科技大学学报（自然科学版）》;20060828;第29卷(第4期);第328-330页 * |
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